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(Solved): 12. Which of the following atoms or ions have the electron configuration 1s22s22p6? (i) Ar (ii) O2 ...
12. Which of the following atoms or ions have the electron configuration (i) (ii) (iii) (iv) a. only (i) b. (i) and (iv) c. only (iv) d. only (ii) e. (ii) and (iv) f. (i) and (iii) g. (ii) and (iii) h. only (iii) i. (i) and (ii) j. (iii) and (iv) k. None of these
Expert Answer
The electron configuration 1s2 2s2 2p6 corresponds to the noble gas neon (Ne).(i) Ar (argon) has an atomic number of 18, which means that it has 18 electrons. Its electron configuration is 1s2 2s2 2p6 3s2 3p6 which is the noble gas configuration for argon.(ii) O2- (oxygen anion) is an ion with two extra electron compared to the neutral oxygen atom.